Due to this circumstance, the RENFE company set up a link that connected the Gibraleón-Ayamonte line with the Tharsis railroad and reached the Corrales station.

[5] During those years its main customer was Fosfórico Español,[Note 2] although other partners, such as Cros and Empresa Nacional de Fertilizantes, also stood out.

[6] Another initiative of that time was developed in the historic Filón Sur deposit, where there were gossan reserves with a great wealth of gold and silver.

[7] At the beginning of the 1990s the company's economic situation had worsened considerably due to external factors such as the fall in prices on the international market.

Since 1993 the mineral was no longer exported by sea to foreign countries, limiting its customers to the companies operating in the Chemical Park of Huelva.

[10] The administrative offices of the company were located in the nucleus of the Pueblo Nuevo de Tharsis, which had once housed the British colony.

A part of the company's activities were carried out in the North Tharsis Lode, where there were numerous facilities: workshops, ore loading dock, offices, etc.